Collection for a Good Cause

A driver is stuck in a traffic jam on Benjamin Sheares Bridge.
Its absolute gridlock... nothing is moving.
Suddenly someone knocks his window. The driver rolls down the window and asks "What's going on?"
"Terrorists are holding MM Lee, SM Goh, and PM Lee to ransom. They're asking for $10 million cash, otherwise they're going to douse them with petrol and set them on fire. We're going from car to car, taking up a collection."
The driver asks, "How much is everyone giving, on average?"
"About a litre" .